Temperature coefficient of the refractive index for PbTe film  

作　　者：徐嶺茂 周晖 何延春 张凯锋 武生虎 熊玉卿 

机构地区：[1]Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730001,China

出　　处：《Chinese Optics Letters》2017年第4期73-75,共3页中国光学快报（英文版）

摘　　要：Specimens of PbTe single film are deposited on Ge substrates by vacuum thermal evaporation.During the temperature range of 80–300 K,the transmittance of a PbTe film within 2–15μm is measured every 20 K by the Perkin Elmer Fourier transform infrared spectroscopy cryogenic testing system.Then,the relationship between the refractive index and wavelength within 7–12μm at different temperatures is received by the full spectrum inversion method fitting.It can be seen that the relationship conforms to the Cauchy formula,which can be fitted.Then,the relationship between the refractive index of the PbTe film and the temperature/wavelength can be expressed as n（λ,T）=5.82840-0.00304T＋4.61458×10-6T2＋8.00280∕λ2＋0.21544∕λ4,which is obtained by the fitting method based on the Cauchy formula.Finally,the designed value obtained by the formula and the measured spectrum are compared to verify the accuracy of the formula.Specimens of PbTe single film are deposited on Ge substrates by vacuum thermal evaporation.During the temperature range of 80–300 K,the transmittance of a PbTe film within 2–15μm is measured every 20 K by the Perkin Elmer Fourier transform infrared spectroscopy cryogenic testing system.Then,the relationship between the refractive index and wavelength within 7–12μm at different temperatures is received by the full spectrum inversion method fitting.It can be seen that the relationship conforms to the Cauchy formula,which can be fitted.Then,the relationship between the refractive index of the PbTe film and the temperature/wavelength can be expressed as n（λ,T）=5.82840-0.00304T＋4.61458×10-6T2＋8.00280∕λ2＋0.21544∕λ4,which is obtained by the fitting method based on the Cauchy formula.Finally,the designed value obtained by the formula and the measured spectrum are compared to verify the accuracy of the formula.

关 键 词：PbTe refractive fitting evaporation transmittance fitted verify Elmer Cauchy inversion 

分 类 号：O484[理学—固体物理]